I am in a shared working space, sharing with around 100 other companies. Lots of the companies need a VPN between them and developers working externally. The office has a very limited number of external IPs, and the ISP's cost for adding to them is prohibitive.
So is it possible to use some kind of hardware / software configuration to have all VPN traffic come through on custom ports? Our (external) tech support provider says it's not possible, because there are only a limited number of ports that the VPN can work through.
I found this question - Multiple VPN Connections, One IP? - but I don't really understand VPNs well enough to discuss the solution with the ISP or tech support.
What type of VPN do we need to set up? What kind of hardware (if any) could support our requirements?